Output Shaft Speed Sensor Circuit - Direction Error

Where it lives

For P077B, the circuit described runs through the sensor. The description of P077B reports a fault at the sensor.

Check these first

• A failing output speed sensor
• A short or open in the sensor wiring
• Corrosion at the sensor connector
• A sensor installed incorrectly
• A TCM software fault

What to do next

1. Read output speed and direction on a scan tool
2. Inspect the sensor and connector for damage
3. Test the sensor wiring for a short or open
4. Verify the sensor is seated correctly
5. Replace the output speed sensor if the direction reads wrong
6. Clear the code and retest

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